[RFC PATCH 6/8] iio: core: Introduce new STEP_DETECT event

[Daniel Baluta <daniel.baluta@intel.com>]

From: Irina Tirdea <irina.tirdea@intel.com>

This event is needed for the step detection functionality of a pedometer:
an interrupt is generated by the hardware device each time
a step is detected.

To support this, we add a new iio event.

For more information on the pedometer requirements for Android see
http://source.android.com/devices/sensors/composite_sensors.html#detector.

A device that has the pedometer functionality this interface needs to
support is Freescale's MMA9553L:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 7 +++++++
 drivers/iio/industrialio-event.c        | 1 +
 include/linux/iio/types.h               | 1 +
 3 files changed, 9 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index c02785d..fd66073 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -815,6 +815,13 @@ Description:
 		Enables or disables motion detection. Each time motion is detected an
 		event of this type will be generated.
 
+What:		/sys/.../events/in_activity_step_detect_either_en
+KernelVersion:	3.17
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Enables or disables step detection. Each time the user takes a step an
+		event of this type will be generated.
+
 What:		/sys/bus/iio/devices/iio:deviceX/trigger/current_trigger
 KernelVersion:	2.6.35
 Contact:	linux-iio@vger.kernel.org
diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index eca5af2..c2ade1f 100644
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -198,6 +198,7 @@ static const char * const iio_ev_type_text[] = {
 	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
 	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
 	[IIO_EV_TYPE_MOTION] = "motion",
+	[IIO_EV_TYPE_STEP_DETECT] = "step_detect",
 };
 
 static const char * const iio_ev_dir_text[] = {
diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index ae51780..83768a6 100644
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -75,6 +75,7 @@ enum iio_event_type {
 	IIO_EV_TYPE_THRESH_ADAPTIVE,
 	IIO_EV_TYPE_MAG_ADAPTIVE,
 	IIO_EV_TYPE_MOTION,
+	IIO_EV_TYPE_STEP_DETECT,
 };
 
 enum iio_event_info {
-- 
1.9.1